ci(docker): distinguish docker_ref and git_ref inputs (#8874)

Refs #8873

.github/workflows/docker-build-push.yml

@@ -4,8 +4,12 @@ name: Build & Push SwaggerUI multi platform Docker image
 on:
   workflow_dispatch:
     inputs:
-      tag:
-        description: Git tag
+      git_ref:
+        description: Git branch, tag or SHA to checkout.
+        type: string
+        required: true
+      docker_tag:
+        description: Docker tag associated with the `git_ref`
         type: string
         required: true
 
@@ -13,6 +17,22 @@ env:
   REGISTRY_IMAGE: swaggerapi/swagger-ui
 
 jobs:
+  inputs:
+    name: Normalize inputs
+    runs-on: ubuntu-latest
+    outputs:
+      git_ref: ${{ steps.workflow_dispatch.outputs.git_ref }}
+      docker_tag: ${{ steps.workflow_dispatch.outputs.git_ref }}
+
+    steps:
+      - name: Set up environment variables for `workflow_dispatch` event
+        id: workflow_dispatch
+        if: ${{ github.event_name == 'workflow_dispatch' }}
+        run: |
+          echo "git_ref=${{ inputs.git_ref }}" >> "$GITHUB_OUTPUT"
+          echo "docker_tag=${{ inputs.docker_tag }}" >> "$GITHUB_OUTPUT"
+
+
   build:
     name: Build & Push SwaggerUI platform specific Docker images
     runs-on: ubuntu-latest
@@ -27,11 +47,13 @@ jobs:
           - linux/386
           - linux/ppc64le
           - linux/s390x
+    needs:
+      - inputs
 
     steps:
       - uses: actions/checkout@v3
         with:
-          ref: ${{ inputs.tag }}
+          ref: ${{ needs.inputs.outputs.git_ref }}
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
@@ -39,12 +61,6 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
 
-      - name: Docker meta
-        id: meta
-        uses: docker/metadata-action@v4
-        with:
-          images: ${{ env.REGISTRY_IMAGE }}
-
       - name: Log in to DockerHub
         uses: docker/login-action@v2
         with:
@@ -78,6 +94,7 @@ jobs:
     name: Merge platform specific Docker image into multi platform image
     runs-on: ubuntu-latest
     needs:
+      - inputs
       - build
 
     steps:
@@ -99,10 +116,10 @@ jobs:
       - name: Create manifest list and push
         working-directory: /tmp/digests
         run: |
-          docker buildx imagetools create -t ${{ env.REGISTRY_IMAGE }}:${{ inputs.tag }} \
-            ${{ env.REGISTRY_IMAGE }}:${{ inputs.tag }} \
+          docker buildx imagetools create -t ${{ env.REGISTRY_IMAGE }}:${{ needs.inputs.outputs.docker_tag }} \
+            ${{ env.REGISTRY_IMAGE }}:${{ needs.inputs.outputs.docker_tag }} \
             $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)
 
       - name: Inspect image
         run: |
-          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ inputs.tag }}
+          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ needs.inputs.outputs.docker_tag }}